HP 21MX/F and OS choices (was Lookee what I just got!)

With that work done, it may be practical to boot your HP over a serial port at a reasonable speed, but loading a large ABS file this way can take a very long time (as things are). I generally don't recommend the serial boot method due to its poor performance. Then again, I think its nothing to throw together a PIC and some I2C eeprom and build little paper tape reader and punch emulators, and I can burn copies of any loader rom you wish. I found that serial booting the system to be the easiest way to get started. I don't recall which one but, one of the loader ROMS will work with the "high speed serial" card and read data off a serial link. There's no handshaking or error correction but, with a short RS232 link, passing data is not a problem. The ABS data format does provide checksum error detection so data errors will be detected. On many occasions, I have loaded HPBASIC and other programs over a serial link with absolutely no problem. The advantage to the serial link is that the only hardware required is a RS232 serial cable. Admittedly, it is not as fast as a parallel link but, who cares ;-) I had to write a PERL script to format the data before passing it to the 1000 but, that was fairly trivial. SeeYa, SteveRob